Don't forget that the BK-7m is a good seller. Its price has not dropped. So I think the BK-9 price drop is only a reaction to lacking demand for this model.
The BK-9 was developed (and I think also manufactured) in Italy by Roland Europe, and as we know, Roland Europe has been dissolved. We still don't know to what extent everything has been, or is being reinstalled in Asia. So an interruption in the arranger business was to be expected anyway. But regarding the success of the BK-7m, I'm not sure Roland will abandon the segment completely.